Raspberries grow well in the cool spring months. Early spring is the ideal time to plant them.
Acidity (pH) Tolerance
Grow in a wide range of soil and acid types.
Salinity (Ec) Tolerance
Raspberries should be fertilized each spring. Apply an all-purpose fertilizer (16-16-8, 10-10-10, or 20-20-20) the first year and ammonium sulfate every year thereafter. Apply one cup of ammonium sulfate (21-0-0) per 10 feet of row.
Raspberries are deep-rooted and should be watered deeply when irrigating. During non-fruiting seasons, raspberries may need water only every two to four weeks depending on weather conditions. During the fruiting season raspberries should be watered more frequently.
Put the water where it will be used. Use a drip or soaker hose system if possible. A good mulch around the plants will help conserve moisture.
Plant Development and Care
There are two types of raspberries, June bearing and everbearing. June bearing produce a heavy crop of berries from June through early July. Everbearing raspberries produce two crops, one in June and one in the fall (September through the first frost). As the plants grow, most raspberries will need to be supported to keep the canes from falling over.
Raspberry plants are capable of producing fruit from every bud on the plant. Because of this, production is similar on canes of about 4 1/2' or less as on canes that are 5' tall or higher. Lower buds produce large fruits. Heading forces lower buds to produce and avoids the need for trellising.
June bearing canes should be pruned every spring. Typically, the fruit is born on two year old wood. After the cane bears it dies and should be removed each year. To determine which canes to pull up, wait until the spring until you see some green growth on the plants. Remove all dead wood that is gray and brittle by cutting the canes at the base. Rasberries will be produced on those canes that grew from the base last year and are brown and viable with spring growth.
Everbearing raspberries produce in the spring and again in the fall. To prune everbearing raspberries, follow one of these two methods:
If a large fall crop is desired with no summer crop, then all the canes are mowed back to 2 to 4 inches each spring. This is the easy, no-decision method and will provide for a large fall crop but no summer crop.
To crop the plants two times a year, prune them as June bearing raspberries. After removing the dead canes in the spring, cut back the remaining live canes to about 5 feet tall.
Germination Time (Days)
Seed Germination and Temperature Range
Common Fertilizer Deficiencies
Iron deficiency, or chlorosis is common in raspberries. Alkaline soil aggravates the condition. Chlorosis is characterized by pale, small, yellowed leaves with dark green veins. In very severe cases, the edges of the leaves dry up and turn brown, and vines grow and yield poorly.
When seeing symptoms of chlorosis, reduce the frequency of watering. If the condition persists, apply Iron Sul or use Sequestrene 138 using recommendations on the bag.